Improves notes_description helper routine

Improves notes_description helper routine to return "unknown" for cases when first note's comment doesn't have event set to "opened" or note doesn't have comments. Added new argument (note's first comment), also updated helper routines usages.

app/helpers/note_helper.rb

@@ -1,9 +1,11 @@
 module NoteHelper
   include ActionView::Helpers::TranslationHelper
 
-  def note_description(author, description)
+  def note_description(author, description, first_comment)
     if !author.nil? && author.status == "deleted"
       RichText.new("text", t("notes.show.description_when_author_is_deleted"))
+    elsif first_comment&.event != "opened"
+      RichText.new("text", t("notes.show.description_when_there_is_no_opening_comment"))
     else
       description
     end

app/views/notes/index.html.erb

@@ -48,7 +48,7 @@
       </td>
       <td><%= link_to note.id, note %></td>
       <td><%= note_author(note.author) %></td>
-      <td><%= note_description(note.author, note.description).to_html %></td>
+      <td><%= note_description(note.author, note.description, current_user&.moderator? ? note.comments.unscope(:where => :visible).first : note.comments.first).to_html %></td>
       <td><%= friendly_date_ago(note.created_at) %></td>
       <td><%= friendly_date_ago(note.updated_at) %></td>
     </tr>

app/views/notes/show.html.erb

@@ -5,7 +5,7 @@
 <div>
   <h4><%= t(".description") %></h4>
   <div class="overflow-hidden ms-2">
-    <%= note_description(@note.author, @note.description).to_html %>
+    <%= note_description(@note.author, @note.description, current_user&.moderator? ? @note.comments.unscope(:where => :visible).first : @note.comments.first).to_html %>
   </div>
 
   <div class="details" data-coordinates="<%= @note.lat %>,<%= @note.lon %>" data-status="<%= @note.status %>">

config/locales/en.yml

@@ -3095,6 +3095,7 @@ en:
       closed_title: "Resolved note #%{note_name}"
       hidden_title: "Hidden note #%{note_name}"
       description_when_author_is_deleted: "deleted"
+      description_when_there_is_no_opening_comment: "unknown"
       event_opened_by_html: "Created by %{user} %{time_ago}"
       event_opened_by_anonymous_html: "Created by anonymous %{time_ago}"
       event_commented_by_html: "Comment from %{user} %{time_ago}"